Photo by Alex Wong/Getty Images(WASHINGTON) -- The U.S. State Department is offering a reward of up to $5 million in exchange for information on four terrorists with ties to western and northern Africa.

Among the terrorists identified is Khalid al-Barnawi, a former leader of Boko Haram, the terrorist organization responsible for the kidnapping of nearly 300 girls in Nigeria. Also named were Hamad el Khairy and Ahmed el Tilemsi, founding members of the terrorist group Movement for Unity and Jihad in West Africa, and Abu-Yusuf al-Muhajir, an explosives expert who was a former member of Tawhid w' al Jihad-Egypt.

The State Department is offering $5 million for information leading to the capture of al-Barnawi, Khairy and Tilemsi and $3 million for information that helps catch al-Muhajir.